Vapor condenser



Sept. 26, 1944. K. F. SCHOELLER VAPOR CONDENSER Filed Oct. 29, 1942 5 Sheets-Sheet l Inventor KWZ F fickaeZZer Attorneys Sept. 26, 1944. K. F, SCHOELLER 2,358,940

VAPOR CONDENSER Filed Oct. 29, 1942 3 Sheets-Sheet 2 30' l V J V I K;

0 7 132 92 J2 a) K A? a QJ I i /l T (9' Inventor J6 M75 F-SCZ/OeZZer 4 P 1944- K. F. SCHOELLEQ 2,358,940

VAPOR CONDENSER Filed Oct. 29, 1942 3 Sheets-Sheet s Inventor lfa/rl 7 5:27am? ZZer Patented Sept. 26, 1944 UNITED STATES 'PTENT OFFIC VAPOR CONDENSER Karl F. Schoeller, Perkasie, Pa.

Application October 29, 1942, Serial No. 463,807

1 Claim.

This invention relates to new and useful improvements in vapor condensers and more particularly to a condenser for use in conjunction with high vacuum pumps to prevent water formation in the crankcase of such pumps.

An important object of the present invention is to provide a condenser of the character stated which employs a refrigerant evaporator for the purpose of causing any moisture in the pump line to be absorbed thus preventing passage of said moisture to the vacuum pump proper.

Other objects and advantages of the invention will become apparent to the reader of the following description.

In the drawings:

Figure 1 represents a top plan view.

Figure 2 is a vertical sectional View taken substantially on the line 2-2 of Figure 1.

Figure 3 is a horizontal sectional view taken substantially on the line 3-3 of Figure 2.

Figure 4 is a fragmentary enlarged horizontal sectional view through the evaporator.

Figure 5 is a fragmentary vertical sectional view through the evaporator at the upper portion thereof.

Figure 6 is a fragmentary vertical sectional view through the lower portion of the evaporator.

Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 denotes a tank having a top 6 and a bottom I. The bottom I has a drain plug 8 therein. The lower portion of the side wall of' the tank 5 has outlet bosses 9 to accommodate fittings from which lines extend to a pump (not shown). The top 6 has an inlet fitting boss in to accommodate a connection to a drier or other machine.

Numeral II generally refers to an evaporator which in construction comprises inner and outer spaced walls I2, I3 closed by top and bottom walls I4, I5. The upper and lower portions of this evaporator have hollow headers I6, I1, respectively, defining circular compartments l8 with which connect refrigerant inlet and outlet pipes I9 and 20, respectively. The top and bottom walls I4, I5 have openings 2| therein to communicate the compartments I8 with the space between the walls I2, I3, so that refrigerant can flow from the inlet pipe I9 upwardly through the space between the walls I2, I3 into the compartment l8 at the top of the evaporator and from there to the outlet pipe 20, and return to the compressor (not shown). The evaporator II is mounted on suitable webs 22 projecting inwardly from the side wall of the tank.

Suitable legs 23 may be employed for supporting the entire unit.

If desired, the headers I6 and Il may be constructed integrally with the side walls, by simply extending the side walls l2a, I3a to form the sidewalls of the headers and then welding or otherwise securing flat rings 30, 3| between the upper and lower portions of the spaced walls I2a, I3a to define compartments 32 corresponding to the compartments I8, the flat rings 3| being formed with apertures 21a to permit flow from the compartments 32 to the space between the intermediate portions of the walls l2a, I311.

.The described vapor condenser is designed to be used in conjunction with a drier operating under a very low vacuum provided by a vacuum pump with the inlet port Ill connected to the drier by a vacuum line. The outlet bosses 9 are designed to be connected to the intake side of the vacuum pump by a suitable line arrangement. The refrigerant is fed into the evaporator by way of inlet pipe I9 and the lower header I5 and under control of a thermostatic expansion valve. The refrigerant is returned by way of outlet pipe 20 to a refrigerant compressor. Refrigerants fed through the lower header l5 are equally distributed throughout the evaporator by means of the openings 2| in said header. The openings 2| in the upper header I4 promote uniform dissipation of refrigerant vapor within the evaporator, thereby preventing possible short circuiting of refrigerants through the evaporator interior. The device is especially adapted for use in vacuum drying processes to absorb moisture and freeze the moisture to the surface of the evaporator, thereby preventing such moisture from passing into the vacuum pump and impairing its efiiciency.

While the foregoing specification sets forth the invention in specific terms, it is tobe understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the inventionfwhat is claimed as new is:

A refrigerant evaporator for use in a vapor condenser of the type including a tank having a vacuum inlet and outlet, said evaporator comprising a cylindrical hollow wall structure adapted to be arranged upright in said tank, and annular inlet and outlet headers at the lower and upper ends of said wall structure having perforated walls establishing communication between the headers and the interior of the hollow wall structure, and refrigerant inlet and outlet pipes extending from the inlet and outlet headers and adapted to extend outside said tank.

KARL F. SCHOELLER. 

